JP5892148B2 - Battery module unit - Google Patents

Description

  The present invention relates to a battery module unit.

  Conventionally, a battery module including a plurality of battery cells is known as a battery module in order to ensure a high voltage and high output power source. As such a battery module, a structure in which a plurality of battery cells are arranged side by side is known, and the battery module is held by a pair of end plates from both ends in the direction in which the battery cells are arranged in parallel. In addition, a technique is known in which a double-sided adhesive tape is disposed between adjacent battery cells to suppress displacement of the battery cells, to dissipate heat, and to insulate.

  In the battery module in which the double-sided adhesive tape is disposed between the battery cells described above, by disposing the double-sided adhesive tape between the end plate located at both ends and the battery cell located next to the end plate, The battery module can be prevented from falling off.

  However, it is necessary to remove the end plate from the battery module at the time of exchanging the components of the battery module and re-adjusting the position (hereinafter referred to as rework), and it is located next to the end plate and the end plate. Depending on the adhesive properties of the double-sided adhesive tape placed between the battery cells, it may be difficult to remove the end plate from the battery module, and in this case, the workability of reworking will be reduced.

  That is, an object of the present invention is to provide a battery module unit that improves rework workability while preventing the battery module from dropping off.

  A battery module unit according to an aspect of the present invention includes a battery module in which a plurality of battery units including battery cells are arranged in parallel, and a pair of end plates that hold the battery module from both ends in the direction in which the battery units are arranged in parallel. And a first double-sided adhesive tape disposed between each of the battery module and the pair of end plates, and an adhesive force between the first double-sided adhesive tape and the end plate and the first double-sided adhesive tape and the battery module. The adhesive force between the first double-sided adhesive tape and the end plate is equal to or more than half of the inertial force acting on the battery module. Different from force value.

  In the battery module unit, since the adhesive force between the first double-sided adhesive tape and the end plate is designed to be larger than the minimum necessary for gripping the battery module, the battery module is dropped in a normal gripping state. Never do. In addition, since the first double-sided adhesive tape is designed so that the value of the adhesive force with the end plate and the value of the adhesive force with the battery module are different, the battery module and the end plate are The one with the smaller adhesive force value can be easily peeled off from the first double-sided adhesive tape, and the workability of rework is improved.

  A battery module unit according to an aspect of the present invention includes a battery module in which a plurality of battery units including battery cells are arranged in parallel, and a pair of end plates that hold the battery module from both ends in the direction in which the battery units are arranged in parallel. And a first double-sided adhesive tape disposed between each of the battery module and the pair of end plates, and an adhesive force between the first double-sided adhesive tape and the end plate and the first double-sided adhesive tape and the battery module. Is greater than or equal to half of the inertial force acting on the battery module and in the vicinity of half of the inertial force.

  In the battery module unit, the adhesive force of the first double-sided adhesive tape to the end plate is designed to be at least the size necessary for gripping the battery module and in the vicinity of the minimum size. Therefore, the battery module does not fall off in a normal gripping state, and the end plate can be easily peeled off from the battery module during rework.

  Moreover, the aspect from which the adhesive force with respect to the end plate of a 1st double-sided adhesive tape and the adhesive force with respect to the battery unit of a 1st double-sided adhesive tape may differ may be sufficient.

  Furthermore, it has the 2nd double-sided adhesive tape each arrange | positioned between adjacent battery units, and the 2nd double-sided adhesive tape and the 1st double-sided adhesive tape are comprised with the same kind of tape with the same adhesive characteristic. It may be an embodiment.

  ADVANTAGE OF THE INVENTION According to this invention, the battery module unit which improved the workability | operativity of rework is provided, preventing the drop-off | omission of a battery module.

FIG. 1 is a schematic perspective view showing a battery module unit of a power supply device according to an aspect of the present invention. FIG. 2 is a schematic plan view of the battery module unit of the power supply device of FIG. FIG. 3 is an exploded perspective view of the battery unit. FIG. 4 is a plan view further illustrating the plan view of FIG. FIG. 5 is a diagram showing the force applied to the battery module. FIG. 6 is a graph showing the relationship between the adhesive strength of the double-sided adhesive tape and the temperature.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected about the same or equivalent element, and the description is abbreviate | omitted when description overlaps.

  First, the battery module unit 1 of the power supply device will be described with reference to FIG. 1, FIG. 2, and FIG.

  As shown in FIG. 1, the battery module unit 1 of the power supply device includes a battery module 10. The battery module 10 includes a plurality (seven in the figure) of battery units 14 arranged in parallel.

  The battery module unit 1 of the power supply device further includes a pair of end plates 16 at both ends of the battery unit 14 in the parallel arrangement direction of the battery module 10, and the plurality of battery units 14 are restrained by the pair of end plates 16. . For example, four bolts 19A to 19D that are inserted into one end plate 16 and extend in the direction of the other end plate 16 are inserted into each battery unit 14 and the other end plate 16. The other end plate 16 is fixed by being screwed to the nut. A fixing member 18 is fixed to each end plate 16. Each end plate 16 is made of iron because high rigidity is required.

  As shown in FIG. 2, the battery module 10 is fixed to a wall W extending in the vertical direction so as to be cantilevered via a fixing member 18.

  As shown in FIG. 3, each battery unit 14 includes a battery cell 20, a resin holder 28, and a heat transfer plate 30.

  The battery cell 20 includes a case 21, an electrode assembly (not shown) housed in the case 21, and a pair of terminals 24 joined to the electrode assembly provided in the case 21. The case 21 is made of a conductive material (for example, aluminum), and includes a bottomed rectangular tube-shaped case main body 22 and a cover plate 23 that covers the opening of the case main body 22. The case main body 22 includes a rectangular flat plate-shaped bottom plate 22a and four side surfaces 22b to 22e that stand up from four sides of the bottom plate 22a. Hereinafter, for convenience of description, of the four side surfaces 22b to 22e, two side surfaces intersecting with the direction in which the battery units 14 are arranged are referred to as a first side surface 22b and a second side surface 22c, and the other two side surfaces are referred to as a third side surface 22d. This is referred to as a fourth side surface 22e.

  The pair of terminals 24 are terminals for taking out the electric power of the electrode assembly of the battery cell 20 to the outside. In the present embodiment, as shown in FIG. 2, terminals 24 having different polarities adjacent to each other are connected to each other via a bus bar 25 so as to be connected in series.

  As shown in FIG. 3, the resin holder 28 is a frame body integrally formed of resin, and includes a wiring portion 28 a disposed on the cover plate 23 and a bottom surface portion 28 b facing the bottom plate 22 a of the case main body portion 22. And a pair of upright portions 28c respectively facing the third side surface 22d and the fourth side surface 22e of the case main body 22.

  The wiring portion 28a includes a peripheral wall 29a erected so as to surround each terminal 24, a pair of outer walls 29b extending vertically upward from the pair of erected portions 28c, and the opposite side of the outer wall 29b across the peripheral wall 29a. And a pair of first bolt guide portions 29d provided between the peripheral wall 29a and the partition wall 29c, respectively.

  The partition wall 29c extends along the direction in which the battery units 14 are arranged side by side. A pair of first bolt guide portions 29d having guide holes 27A and 27B for guiding the bolts 19A and 19B described above are provided on the terminal 24 side of the partition wall 29c.

  The resin holder 28 further includes a pair of second bolt guide portions 28d having guide holes 27C and 27D for guiding the bolts 19C and 19D described above, which are defined by the bottom surface portion 28b and the pair of standing portions 28c. Provided at the corner.

  The heat transfer plate 30 is an L-shaped metal plate disposed so as to cover the first side surface 22b and the third side surface 22d of the case body 22 and is made of, for example, aluminum. The heat transfer plate 30 can receive the heat of the battery cell 20 at the portion covering the first side surface 22b and radiate the heat to the wall W from the portion covering the third side surface 22d.

  Since the resin holder 28 described above does not have a portion that covers the first side surface 22 b and the second side surface 22 c of the case body 22, the heat transfer plate 30 is the first of the battery cells 20 held by the resin holder 28. It contacts the side surface 22b.

  It should be noted that a double-sided adhesive tape (second double-sided adhesive tape) 26 is affixed to the first side surface 22b and the second side surface 22c of the battery cell 20 on the entire surface excluding the outer edge region. Therefore, the heat transfer plate 30 is bonded to the first side surface 22 b of the battery cell 20 via the double-sided adhesive tape 26. As shown in FIG. 3, since the heat transfer plate 30 of the adjacent battery unit 14 is also present on the second side surface 22 c side of the battery cell 20, the battery cell 20 positioned on both sides in the parallel arrangement direction of the battery units 14. Each battery cell 20 except for is sandwiched between a pair of heat transfer plates 30 via a double-sided adhesive tape 26.

  As shown in FIG. 4, the battery module unit 1 further includes a double-sided adhesive tape 26 disposed between the battery module 10 and the end plate 16. Specifically, the surface of the heat transfer plate 30 (hereinafter referred to as the first bonding surface 10a) of the battery unit (hereinafter referred to as battery unit 14A) located at one end of the battery module 10 in the direction in which the battery units 14 are arranged in parallel. ) Is attached to the second side of the case 21 of the battery cell 20 of the battery unit 14 (hereinafter referred to as the battery unit 14B) located at the other end of the battery module 10 in the direction in which the battery units 14 are juxtaposed. Double-sided adhesive tape 26 is adhered to side surface 22c (hereinafter referred to as second adhesive surface 10b). For convenience of explanation, hereinafter, the double-sided adhesive tape 26 disposed between the battery module 10 and the end plate 16 is also referred to as an outermost tape (first double-sided adhesive tape) 26A.

  In the outermost tape 26 </ b> A of the present embodiment, the adhesive force of the surface 26 a bonded to the end plate 16 and the adhesive force of the surface 26 b bonded to the battery module 10 (battery cell 20, heat transfer plate 30). Designed to be the same.

  On the other hand, the end plate 16 is made of iron as described above, and the case 21 and the heat transfer plate 30 of the battery cell 20 are made of aluminum. Since the surface roughness of iron is rougher than the surface roughness of aluminum, the surface roughness of the end plate 16 to which the outermost tape 26A is bonded (hereinafter referred to as the end plate bonding surface 16a) is the first surface roughness. It is rougher than the surface roughness of the first adhesive surface 10a and the surface roughness of the second adhesive surface 10b. Note that the area of the end plate bonding surface 16a, the area of the first bonding surface 10a, and the area of the second bonding surface 10b are all the same.

  Here, the adhesive force J between the double-sided adhesive tape 26 and the adhesive member to which the double-sided adhesive tape 26 is bonded is mainly the adhesive strength T of the double-sided adhesive tape 26 and the surface to which the double-sided adhesive tape 26 in the adhesive member is bonded. And the surface roughness V of the surface to which the double-sided tape 26 is bonded in the adhesive member.

  Therefore, even if most of the parameter values that determine the adhesive force J between the double-sided adhesive tape 26 and the adhesive member to which the double-sided adhesive tape 26 is bonded are the same, The adhesive force J between the double-sided adhesive tape 26 and the adhesive member changes only by different values.

  In this embodiment, since the surface roughness of the end plate bonding surface 16a is different from the surface roughness of the first bonding surface 10a and the surface roughness of the second bonding surface 10b, the end plate 16 and the outermost tape 26A. Is smaller than the adhesive force J (hereinafter also referred to as the adhesive force J2) between the battery module 10 and the outermost tape 26A (that is, J1). <J2). In the present embodiment, parameters for determining the adhesive strength J other than the surface roughness (for example, the adhesive strength of both surfaces of the outermost tape 26A, the area of the end plate adhesive surface 16a, the area of the first adhesive surface 10a, The area and the like of the second adhesive surface 10b are all the same.

  It should be noted that the adhesive composition on the both surfaces of the outermost tape 26A is made different from each other so that the adhesive force of the surface 26a on the end plate 16 side is smaller than the adhesive force of the surface 26b on the battery cell 20 or heat transfer plate 30 side. It may be made to become.

  And, by designing the adhesive force between the end plate 16 and the outermost tape 26A to a minimum required size that does not cause the battery module 10 to drop off, it is easy to remove the end plate 16 from the battery module 10 during rework. become.

The minimum required magnitude can be determined from the magnitude of the force shown in FIG. In FIG. 5, the vector indicated by the symbol F indicates the inertial force acting on the battery module 10. This inertial force includes the weight M [kg] of the battery module 10, the impact G that the battery module 10 should satisfy (impact on the battery module 10 that satisfies at least the law), and the gravitational acceleration 9.8 [m / s ² ]. (Ie, F = M × G × 9.8).

  Therefore, the adhesive force J1 between the end plate 16 and the outermost tape 26A and the adhesive force J2 between the battery module 10 and the outermost tape 26A only need to have at least an adhesive force that can withstand an inertia force of F / 2. That is, if J1, J2 ≧ F / 2, the battery module 10 is gripped between the end plates 16 without falling off.

  However, when J1, J2 = F / 2, there is a possibility that sufficient safety may not be ensured, so it is preferable to multiply by a predetermined safety factor (about 1.5 to 2.0). That is, the adhesive force J1 between the end plate 16 and the outermost tape 26A and the adhesive force J2 between the battery module 10 and the outermost tape 26A are greater than or equal to F / 2 and close to the size of F / 2. Preferably it is designed.

  In addition, as shown in the graph of FIG. 6, the adhesive force T of the outermost tape 26 </ b> A is the operating temperature range of the battery module 10 (−40 ° C. to 72 ° C., the lithium ion battery specified in the UN dangerous goods transportation recommendation. Temperature conditions). That is, the adhesive strength T of the outermost tape 26A monotonously decreases as the temperature rises, and the adhesive strength becomes weakest at the maximum operating temperature of 72 ° C.

  Therefore, in order to prevent the battery module 10 from dropping in the operating temperature range, the adhesive strength J1 between the end plate 16 and the outermost tape 26A when the adhesive strength of the outermost tape 26A is the maximum operating temperature of 72 ° C. In addition, the adhesive force J2 between the battery module 10 and the outermost tape 26A needs to satisfy J1, J2 ≧ F / 2, and more preferably, the outermost tape 26A has a size in the vicinity of F / 2. Adhesive strength is designed.

  As described above, in the battery module unit 1 described above, the value of the adhesive force J1 between the end plate 16 and the outermost tape 26A and the value of the adhesive force J2 between the battery module 10 and the outermost tape 26A are It is designed to have a size larger than the minimum required for gripping the battery module 10. Therefore, the battery module 10 does not fall off in a normal gripping state.

  In the battery module unit 1, the value of the adhesive force J1 between the end plate 16 and the outermost tape 26A is different from the value of the adhesive force J2 between the battery module 10 and the outermost tape 26A. Specifically, The value of the adhesive force J1 between the end plate 16 and the outermost tape 26A is smaller than the value of the adhesive force J2 between the battery module 10 and the outermost tape 26A. Therefore, at the time of reworking, the values of the adhesive forces J1 and J2 between the battery module 10 and the end plate 16 bonded to the outermost tape 26A and the outermost tape 26A are smaller (in this embodiment, The end plate 16) can be easily peeled from the outermost tape 26A. As a result, the workability of rework is improved.

  Furthermore, in the battery module unit 1, the value is the smaller of the value of the adhesive force J1 between the end plate 16 and the outermost tape 26A and the value of the adhesive force J2 between the battery module 10 and the outermost tape 26A. The adhesive force J1 is designed to be greater than the minimum necessary size for gripping the battery module 10 and in the vicinity of the minimum necessary size. Therefore, the battery module 10 does not fall off in a normal gripping state, and the end plate 16 can be easily peeled off from the battery module 10 during rework.

  In addition, the adhesive force J1 between the end plate 16 and the outermost tape 26A is smaller than the adhesive force J2 between the battery module and the outermost tape 26A by designing the adhesive forces on both surfaces of the outermost tape 26A to be different from each other. May be. Further, by making the area of the end plate bonding surface 16a smaller than the area of the first bonding surface 10a and the area of the second bonding surface 10b, the adhesive force J1 between the end plate 16 and the outermost tape 26A can be reduced. And the adhesive force J2 between the outermost tape 26A and the outermost tape 26A. That is, any of the plurality of parameters may be changed.

  Contrary to the embodiment described above, the adhesive force J1 between the end plate 16 and the outermost tape 26A may be larger than the adhesive force J2 between the battery module 10 and the outermost tape 26A (ie, J1> J2). In this case, the smaller adhesive strength J1 is designed to be greater than the minimum required size for gripping the battery module 10 and in the vicinity of the minimum required size.

  Further, the outermost tape 26 </ b> A may be composed of the same type of tape that has the same adhesive properties as the double-sided adhesive tape 26 that is disposed on both surfaces of the battery cell 20 in the direction intersecting with the parallel arrangement direction of the battery units 14. Good. In this case, it is preferable that the surface roughness of the end plate bonding surface 16a is rougher than the surface roughness of the first bonding surface 10a and the surface roughness of the second bonding surface 10b. According to this, it is not necessary to separately prepare a tape, and simplification in parts procurement is achieved.

  Further, the outermost tape 26A and the double-sided adhesive tape 26 disposed on both surfaces of the battery cell 20 in the direction intersecting with the direction in which the battery units 14 are arranged may be different types of tapes having different adhesive properties.

  Moreover, the battery unit 14 should just have the battery cell 20 at least, and does not need to have the heat-transfer plate 30 and the resin holder 28. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Battery module unit, 10 ... Battery module, 16 ... End plate, 14 ... Battery unit, 26, 26A ... Double-sided adhesive tape, 20 ... Battery cell, 30 ... Heat-transfer plate.

Claims (3)

A battery module including a plurality of battery units including battery cells;
A pair of end plates that support the battery module by gripping from both ends in the direction in which the battery units are arranged side by side;
A first double-sided adhesive tape disposed between each of the battery module and the pair of end plates;
Half of the inertial force in the direction orthogonal to the parallel arrangement direction of the battery units, in which the force of supporting the battery module via the first double-sided adhesive tape of each of the pair of end plates acts on the battery module Greater than or equal to
The value of the adhesive strength between the first double-sided adhesive tape and the end plate, unlike the value of the adhesive force of the first double-sided adhesive tape and said battery module,
The inertial force, Ru Sekidea with the value of the weight and impact the battery module satisfactory battery module and the gravitational acceleration, the battery module unit. A battery module including a plurality of battery units including battery cells;
A pair of end plates that support the battery module by gripping from both ends in the direction in which the battery units are arranged side by side;
A first double-sided adhesive tape disposed between each of the battery module and the pair of end plates;
Half of the inertial force in the direction orthogonal to the parallel arrangement direction of the battery units, in which the force of supporting the battery module via the first double-sided adhesive tape of each of the pair of end plates acts on the battery module der value or more is, is 1.5 to 2.0 times the half of the value of the inertial force,
The inertial force, Ru Sekidea with the value of the weight and impact the battery module satisfactory battery module and the gravitational acceleration, the battery module unit. Comprising a second double-sided adhesive tape disposed between adjacent battery units,
The battery module unit according to claim 1 or 2 , wherein the second double-sided adhesive tape and the first double-sided adhesive tape are made of the same type of tape having the same adhesive property.

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